Engraving-machine.



F. DECKEL.

ENGRAVING MACHINE.

APPLICATION FILED 213.10, 191a.

Patented Aug. 4, 1914.

ac i a of which forms a sector with a center angle STA ramnarcn nncann, or uunxcn, eminent.

. amenities/lamina p Specification of Letters Patent. i Patfl l Au .1914- Application flied February 10, sia'. Serial no, 147.24 9;

,To all whom it may concern:

Be it known that I, F BIEDRICH DECKEL, a subject of the German mperor, residing at Mozartstrasse 17, Munich, Germany, have 5 invented certain new and useful Improve ments in Engraving-Machines, of which the following is a specification. My invention relates generally to' engrav-x ing machines, and has particular'reference to the means for supporting the rotary "out .tefr or cutting tool employed in such Ina-H chines and to the construction of the cutter itselfi i I The principal object of my invention is to improve the detail structure of the cutter shaft of engraving machines, and I accom plish this object by making the shaft of two parts, connected. by'an elastic. non-metallic coupling, one part of the shaft carrying the cutter and the other part the pulley for driving the shaft. The coupling should be ofsuch a character, that the vibrations set up in the part of the shaft carrying the pulley. will not be transmitted to the cutter-carrying part of the shaft, and the simplest form of coupling includes a gut connection be- I tween the coupling members of the shaft,

parts.

. Another object of the invention relates to the structure of the cutter, the cross section of 90. The engraving point of the cutter lies therefore in the middle axis and is always the same distance from the cutting edges. The result of this is, that on grinding the cutter no eccentric displacement of the engraving point is possible and the out ter always works exactly. 1

The invention is illustratively exemplified in the accompanying drawing, wherein- Figure l is a part elevational and part sectional view of a portion of an engraving machine embodying my invention. Figs, 2 and 3 are elevational views of the cutter on agreatly enlarged scale. Fig. 4 is a section on the line A-B of Fig. 2.

Referring to the drawing, the character I) denotes that part of the bi-part shaft which carries the cutting tool .a. T he other part of the shaft is designated 0 and carries the pulley (2, over which the cord for rotati the shaft passes. The lower end of the she t part c is forked 01 bifurcated at e, and takes over the reduced upper end f of the shaft part b. The coupling members e and f are .justed position on the sha t, the pulley" is connected. by a section of gut g, which serves the purpose of a coupling pin. The shaft part 0 1s angular in cross section, and in order that the pulley (5 ma be held in adprovided with a hub or boss k having a key way a into which the key It is adapted to be inserted.

For the purpose of insuring the smooth operation of the part. b of the shaft, which carries the cutter a, and in order to compensate for the Wear on this part of the shaft due to the axial strain thereon, I provide this part of the shaft with an intermediate disk or shoulder Z working against ball. bearings m and n, which are held against the disk Z by a flexible follower device.

This follower includes a plurality of spiral springs o, inclosed by a sectional casing 12,- thelower ends of the springs acting against a plug g, while the upper ends of the sprmgs act against the dlS r, which forms the up r head of the casing p. The co tion 0 the springs forces the disk 1' with a yielding pressure against the lower bear-g ing balls and tends to keep the collar Z'in' intimate contact with both the up or and j lower ball "bearings. The entire ollower.

device is secured in an outer casing t by v 85 means of a threaded not a, and is carricdin" the lower arm 'v of the'machine'frame w.

The upper arm '0 of the frame w carries the bearing support iv for the pulley d, said arms being pivotally held byv the-trunnions 2.1

The cross section of the cutter a is as shown in Fig. 4 a sector with a center angle of 90. The engraving point a of the cutter lies therefore in the middle axis a and has always the same distance from the cutting edges a, a, which are inclined toward the point a at a and a (Figs. 2 and 3).

What I claim is: v 1. An engraving machine, embodying therein a cutter shaft composed of sections arranged in axial alinement, and a flexible, non-metallic, vibration-absorbing oouplin passing directly through adjacent ends 0 the shaft sections for connecting the same together.

2. An engraving machine, therein a shaft consisting of axially alined sections, a section of gut assing directly through adjacent ends of said shaft sect-ions to connect the latter together, and a cutting 110 embodying tool mounted in the free end of said sectional shaft.

3. An engraving machine, embodying therein a sectional shaft, a flexible nonmetallio coupling passing directly through adjadent ends of the shaft sections for connecting the latter to each other, a cutting tool carried by one of said parts and means carried by the other of said parts, whereby the entire shaft may be rotated.

4. An engraving machine, embodying therein a sectional shaft, one part of said shaft having a bifurcated end and the other part of said shafthaving a reduced end adapted to be connected with said bifurcated end, a g lt connection between said ends, a cutting tool carried by one of said shaft parts, and means carried by the other of said parts, whereby the entire shaft may be rotated.

5. An engraving machine, embodying therein a bi-part shaft, a flexible coupling between the parts of said shaft, means on one of the parts of the shaft whereby the latter may be rotated, a collar formed on the other shaft part, anti-friction bearings adjacent each face of said collar, and means whereby 'said collar is yieldingly forced into intimate contact with said anti-friction bearings.

In testimony whereof I have affixed my signature in presence of two witnesses.

FRIEDRICH DEGKEL. Witnesses:

RICHARD LEMP, JOHANNA STERN, 

